用零长度字符指示不存在数据 若要在 Microsoft Access 数据库中指示不存在数据,可以在“文本”或“备注”字段输入零长度字符串 (零长度字符串:不含字符的字符串。可以使用零长度字符串来表明您知道该字段没有值。输入零长度字符串的方法是键入两个彼此之间没有空格的双引号 (" ")。)。在连接到 Microsoft SQL Server 数据库的 Microsoft Access 项目 (Microsoft Access 项目:与 Microsoft SQ...[ 查看全文 ]
Deleting all data from an Access database Sometimes it may be necessary to delete all the data in a database while retaining the table structure. If done manually, this job can quickly become tedious. If your database has many tables, the following code will clear all the data in a hurry. Dim ctr As Container, doc As Document, db As Database Set db = CurrentDB() Set ctr ...[ 查看全文 ]